Symmetric and asymmetric reheating

Hardy, Edward ORCID: 0000-0003-3263-6575 and Unwin, James (2017) Symmetric and asymmetric reheating. JOURNAL OF HIGH ENERGY PHYSICS, 2017 (9). 113-.

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Official URL: http://dx.doi.org/10.1007/JHEP09(2017)113

Abstract

We study models in which the inflaton is coupled to two otherwise decoupled sectors, and the effect of preheating and related processes on their energy densities during the evolution of the universe. Over most of parameter space, preheating is not disrupted by the presence of extra sectors, and even comparatively weakly coupled sectors can get an order 1 fraction of the total energy at this time. If two sectors are both preheated, the high number densities could also lead to inflaton mediated thermalisation. If only one sector is preheated, Bose enhancement of the late time inflaton decays may cause significant deviations from the perturbative prediction for their relative reheat temperatures. Meanwhile, in Non-Oscillatory inflation models resonant effects can result in exponentially large final temperature differences between sectors that have similar couplings to the inflaton. Asymmetric reheating is potentially relevant for a range of beyond the Standard Model physics scenarios. We show that in dark matter freeze-in models, hidden sector temperatures a factor of 10 below that of the visible sector are typically needed for the relic abundance to be set solely by freeze-in dynamics.

Item Type:	Article
Additional Information:	JHEP version
Uncontrolled Keywords:	Cosmology of Theories beyond the SM, Thermal Field Theory
Depositing User:	Symplectic Admin
Date Deposited:	03 Oct 2017 15:40
Last Modified:	15 Mar 2024 13:35
DOI:	10.1007/JHEP09(2017)113
Open Access URL:	https://link.springer.com/article/10.1007/JHEP09(2...
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3009751